Abstract: An off-column conductivity detector for ion electrophoresis measurements is formed from a first connector having a body carrying the discharge end of a separation capillary and a second connector having a body carrying a measuring electrode. The geometry of the detector, and the relative positioning of the capillary and the measuring electrode within the connectors, result in an active measuring cell of precise and minute dimensions that provides measurements of high resolution and high sensitivity rapidly and reliably, despite the provision for rapid disassembly and reassembly by the end user for purposes of cleaning, electrode substitution, and the like.